all–comers

Definition of all–comers

: not restricted to a particular group or category of participants :openAt an all-comers track meet he entered the 1,500 meters in his school shorts and no shoes. — Daniel Silva, The Unlikely Spy, 1995One week into the exhibition season and the 49ers are practically holding all-comers tryouts for quarterback. — Scott Ostler, San Francisco Chronicle, 15 Aug. 2011